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Btrfs: check if we can nocow if we don't have data space

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We always just try and reserve data space when we write, but if we are out of
space but have prealloc'ed extents we should still successfully write.  This
patch will try and see if we can write to prealloc'ed space and if we can go
ahead and allow the write to continue.  With this patch we now pass xfstests
generic/274.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-06-21 16:37:03 -04:00
commit 7ee9e4405f
6 changed files with 148 additions and 26 deletions
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